Above the tree line there is a zone that is generally called alpine tundra.

林木线上方有一个区域，通常被称为高山苔原。

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This rapid zone of transition is called the upper timberline or tree line.

这种快速的过渡地带被称为“上树带线”或“林木线”。

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To illustrate smarter manufacturing, this example tracks an automobile as it moves along an assembly line from work zone to work zone. The two important aspects of this scenario are to.

为了演示更智能的生产，本例将跟踪一辆汽车沿着装配线在工作区中的移动。

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Spalted wood is wood that has been infiltrated by "waves" of decay, with each wave leaving a uniquely outlined stain-zone line.

NPR: Excerpt: 'A Splintered History Of Wood'

The changes would bring the CI Zone into line with international practice.

BBC: Channel Islands airspace controls reviewed

The BBC's Lucy Williamson in Seoul says that about a million soldiers and a million land mines line the Demilitarised Zone, and only a handful of people have crossed from North to South by land in the past few years.

BBC: North Korea soldier 'defects to South'